RobWalker2 Posted January 17, 2013 Report Share Posted January 17, 2013 (25-j15)^2 can be expanded to give (400-j750).. as per my lectures notes. But how.... Quote Link to comment Share on other sites More sharing options...
Pashley26 Posted January 17, 2013 Report Share Posted January 17, 2013 (edited) Oxford, Watford and Stanstead if continuing on the M25. Also joins M4 West (Reading/Slough etc) or can link to M4 north east for London Heathrow but only terminals 1,2 and 3. Edited January 17, 2013 by Pashley26 3 Quote Link to comment Share on other sites More sharing options...
Revolver Posted January 17, 2013 Report Share Posted January 17, 2013 Quote Link to comment Share on other sites More sharing options...
RobWalker2 Posted January 17, 2013 Author Report Share Posted January 17, 2013 i like what you did there Quote Link to comment Share on other sites More sharing options...
monkeyseemonkeydo Posted January 17, 2013 Report Share Posted January 17, 2013 (25-j15)^2 can be expanded to give (400-j750).. as per my lectures notes. But how.... Doesn't work... if you expand the brackets you'll end up with a j2 term... Quote Link to comment Share on other sites More sharing options...
ManxTrialSpaz Posted January 17, 2013 Report Share Posted January 17, 2013 (edited) (25-j15)2 =(25*25)+(25*-15j)+(-15j*25)+(-15j*-15j) =625-375j-375j-225 =400-750j Remember that j=sqrt(-1) so j2 = -1 Edited January 17, 2013 by ManxTrialSpaz 1 Quote Link to comment Share on other sites More sharing options...
Al_Fel Posted January 17, 2013 Report Share Posted January 17, 2013 I can help. It's "Maths" 2 Quote Link to comment Share on other sites More sharing options...
monkeyseemonkeydo Posted January 17, 2013 Report Share Posted January 17, 2013 Ah... ok. I was taking j to be just an unknown term rather than an imaginary number. Quote Link to comment Share on other sites More sharing options...
RobWalker2 Posted January 17, 2013 Author Report Share Posted January 17, 2013 Sorry yeah i should have pointed out the imaginary part of this whole thing. Thanks for your help, i've got it now and worked through another few questions with good results. Damn imaginary numbers and your rediculous rules. Quote Link to comment Share on other sites More sharing options...
casualjoe Posted January 17, 2013 Report Share Posted January 17, 2013 oooh, complex numbers are my faves, it's the most useful maths i think i've ever learned, such seriously powerful stuff. Quote Link to comment Share on other sites More sharing options...
showurcolours Posted January 17, 2013 Report Share Posted January 17, 2013 Mathematical Anti-Telharsic Harfatum Septomin In other words, Maths. Quote Link to comment Share on other sites More sharing options...
Tony Harrison Posted January 18, 2013 Report Share Posted January 18, 2013 I can help. It's "Maths" It's bad enough kids going into shops and saying "Can I get... " instead of "May I have...". When this horrible US talk has kids saying "math" when they know it's "maths"... that'll be a sad day indeed. 3 Quote Link to comment Share on other sites More sharing options...
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